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Homework Help: Amplitude of spring

  1. Jul 21, 2007 #1
    1. The problem statement, all variables and given/known data

    A block of mass 0.28kg is attached to a spring of spring constant 12N/m on a frictionless track. The block moves in simple harmonic motion with amplitude 0.2m. While passing through the equilibrium point from left to right, the block is struck by a bullet, which stops inside the block. The velocity of the bullet immediately before it strikes the block is 53m/s and the mass of the bullet is 4.4g.
    How long will it take for the block to reach maximum amplitude [which I calculated to be 0.3246) after the collision?

    2. Relevant equations

    M1V1 + M2V2 = (M1+M2)Vf
    x = Bsin(wt+alpha)
    I found Vf = 1.309 m/s

    3. The attempt at a solution

    I think the answer will have to solved using the equation, x = Bsin (wt + alpha), but I don't know what numbers to plug in for those. Any help would be greatly appreciated!
  2. jcsd
  3. Jul 21, 2007 #2
    I got the answer. :)
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